// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/macros.h"
#include "base/power_monitor/power_monitor.h"
#include "base/test/power_monitor_test_base.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

class PowerMonitorTest : public testing::Test {
protected:
    PowerMonitorTest()
    {
        power_monitor_source_ = new PowerMonitorTestSource();
        power_monitor_.reset(new PowerMonitor(
            std::unique_ptr<PowerMonitorSource>(power_monitor_source_)));
    }
    ~PowerMonitorTest() override {};

    PowerMonitorTestSource* source() { return power_monitor_source_; }
    PowerMonitor* monitor() { return power_monitor_.get(); }

private:
    PowerMonitorTestSource* power_monitor_source_;
    std::unique_ptr<PowerMonitor> power_monitor_;

    DISALLOW_COPY_AND_ASSIGN(PowerMonitorTest);
};

// PowerMonitorSource is tightly coupled with the PowerMonitor, so this test
// Will cover both classes
TEST_F(PowerMonitorTest, PowerNotifications)
{
    const int kObservers = 5;

    PowerMonitorTestObserver observers[kObservers];
    for (int index = 0; index < kObservers; ++index)
        monitor()->AddObserver(&observers[index]);

    // Sending resume when not suspended should have no effect.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 0);

    // Pretend we suspended.
    source()->GenerateSuspendEvent();
    // Ensure all observers were notified of the event
    for (int index = 0; index < kObservers; ++index)
        EXPECT_EQ(observers[index].suspends(), 1);

    // Send a second suspend notification.  This should be suppressed.
    source()->GenerateSuspendEvent();
    EXPECT_EQ(observers[0].suspends(), 1);

    // Pretend we were awakened.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 1);

    // Send a duplicate resume notification.  This should be suppressed.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 1);

    // Pretend the device has gone on battery power
    source()->GeneratePowerStateEvent(true);
    EXPECT_EQ(observers[0].power_state_changes(), 1);
    EXPECT_EQ(observers[0].last_power_state(), true);

    // Repeated indications the device is on battery power should be suppressed.
    source()->GeneratePowerStateEvent(true);
    EXPECT_EQ(observers[0].power_state_changes(), 1);

    // Pretend the device has gone off battery power
    source()->GeneratePowerStateEvent(false);
    EXPECT_EQ(observers[0].power_state_changes(), 2);
    EXPECT_EQ(observers[0].last_power_state(), false);

    // Repeated indications the device is off battery power should be suppressed.
    source()->GeneratePowerStateEvent(false);
    EXPECT_EQ(observers[0].power_state_changes(), 2);
}

} // namespace base
